BEACH PETROLEUM: Deutsche Bank and its related bodies corporate became a substantial shareholder on May 23, with a voting power of 5.34%,

BHP BILLITON: BHP Billiton Limited announced that on May 25, it purchased 1 million ordinary shares of BHP Billiton Plc at an average price of £11.80 each.

Following the above transaction, BHP Billiton Plc holds 25.01 million of its ordinary shares as treasury shares and BHP Billiton Limited holds 25.81 million of the ordinary shares in BHP Billiton Plc, for a total of 50.82 million shares.

The total number of BHP Billiton Plc ordinary shares in issue (excluding shares held as treasury shares and shares held by BHP Billiton Limited) is 2.316 billion.

COOPER ENERGY: Acorn Capital decreased its substantial holding to 5.53% on May 29.

ENERGY DEVELOPMENTS: National Australia Bank ceased to be a substantial shareholder on May 28.

GAWLER RESOURCES: Aurora Oil & Gas changed its substantial shareholding to 22% on May 23.

GULFX: Robert Nichevich, who resigned as a director on May 25, retains an indirect interest in 2.64 million ordinary shares, 1.45 million options expiring December 31, 2009 and 1 million discovery shares.

Ian Middlemas, who was appointed as a director on May 25, will, subject to shareholder approval, be entitled to participate in a placement of 7000 fully paid ordinary shares at 4c each together with one free attaching option (exercisable at 8c and expiring on December 31, 2011) for every share issued.

Mark Pearce, who was appointed as director on May 25, will, subject to shareholder approval, be entitled to participate in a placement of 3500 fully paid ordinary shares at 4c each together with one free attaching option (exercisable at 8c and expiring on December 31, 2011) for every share issued.

METHANOL AUSTRALIA: Grange Securities and related bodies corporate became a substantial shareholder on April 10.

TAP OIL: UBS Nominees and its related bodies corporate increased their substantial shareholding to 8.62% on May 23.

TOMAHAWK ENERGY:Peter Moore, Sam Gazal and Robert Gaunt, who were appointed as directors on May 23, hold the following interests:

Moore holds an indirect interest in 11.1 million ordinary shares and 9.25 million options. Gazal holds an indirect interest in 1.77 million ordinary shares, 1.05 million options, 180,000 ordinary shares and 75,000 options. Gaunt holds an indirect interest in 2.55 million ordinary shares and 1.19 million options.

Anthony Brennan, who resigned as director on May 23, retains an indirect interest in 2.63 million fully paid ordinary shares and 560,000 options.

Garry Ralston, who resigned as a director on May 23, retains a direct interest in 300,000 fully paid ordinary shares and an indirect interest in 375,000 fully paid ordinary shares and 375,000 options, 10,000 fully paid ordinary shares and 5000 options, 10,000 fully paid ordinary shares and 5000 options